From The Collaborative International Dictionary of English v.0.48:

Za \Za\, n. (Min.)
   An old solfeggio name for B flat; the seventh harmonic, as
   heard in the or aeolian string; -- so called by Tartini. It
   was long considered a false, but is the true note of the
   chord of the flat seventh. --H. W. Poole.
   [1913 Webster] Zabaism
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